Now that theiPhone Dev Team has released RedSn0w 0.9.13dev3, it’s easy tojailbreakthe latestiOS 6 beta 3release. This jailbreak will also work with previous versions of iOS 6 beta, such as iOS 6 beta 2.
Bear in mind that this is still a tethered jailbreak, and it will not install Cydia on your device. Since you must point to the current beta firmware, you need to be a developer so that you can access iOS 6 beta 3.

If you meet these requirements, then step right inside as we walk you though using RedSn0w 0.9.13dev3 to jailbreak an iPhone 4 running iOS 6 beta 3.
[tube]http://www.youtube.com/watch?v=Uj-scuBjeD8[/tube]
Step 1:Download and run RedSn0w 0.9.13dev3.
Step 2:Place your device into DFU mode.
Step 3:In RedSn0w click Extras >Select IPSWand point to your iOS 6 beta 3 firmware. RedSn0w should display a message stating that the firmware was successfully identified.
Step 4:Go back to the main page of RedSn0w and click jailbreak. Once preliminary configuration is complete, ensure Install SSH is selected, and continue. The jailbreak process should finish to completion.
Step 5:Once back to the Home screen on your device, place the device back into DFU mode, and perform Step 3 again.
Step 6:ClickJust bootunder the Extras menu subset, and RedSn0w will perform a tethered boot on your device.
That’s all there is to it, your device should now be jailbroken running iOS 6 beta 3. Keep in mind that while this will install SSH on your device, it will not install Cydia. If you want Cydia, then try ouriOS 6 Cydia installation tutorial.
Are you a developer who’s successfully jailbroken your iOS 6 beta 3 device? Sound off in the comments below.
Update:After further testing, I’ve discovered that the Cydia method described above no longer works for me with beta 3. I apologize if the post was misleading in any way.